The symptom is that the leaves of holly appear gray brown spots, which are mostly round or oval. When the humidity is high, the surface of the diseased part is covered with gray white mould layer. The preventive measures are as follows:
Remove and burn the diseased leaves in time to reduce the source of infection; apply oak leaves or cottonseed powder to the soil; spray Bordeaux solution and other copper preparations on the plants or fungicides such as Formica iron to prevent and control, and spray 600 times of 75% chlorothalonil wettable powder.
The disease will cause the epidermis of the branches of Ilex to turn brown, and large leaves to wither and fall. Because the plants cannot obtain nutrition, the plants will die. The symptoms of the disease are very similar to the death of the plant due to water loss. And once there is a disease, often more serious, prevention and control is relatively difficult, generally based on prevention. The specific control methods are as follows:
After pruning, spray 800 times of Xinzi wettable powder and 1000 times of amidocapramine immediately to protect the wounds from germs.
(2) spray 10 times a day with 600 times of aseptic fungicide or 600 times spray of Xin Zi Qing wettable powder for three times.
Can spray 10% antibacterial agent 401 acetic acid solution 1000 times.
For the prevention of pests, first of all, we should choose the healthy growth of holly seedlings for planting, planting density should be appropriate, pay attention to ventilation and so on
For aphids, leafhoppers and scale insects, spray 50% fenitrothion EC 1000 times. In case of red spider damage, spray 20% diclofenac sulfone WP 1000 times.
